Hello,
I have just been through the same decision process for a 4 night stay in late August 2016 for me, my wife and my daughter.
We went with 4 nights in the IC Times Square using the following;
2 Nights paid using the Ambassador BOGO voucher
2 Nights on points - 100,000K
I am a Spire Ambassador, so hopeful of an room upgrade, and also will use the late check out on the final day.